Tread configuration on folding case



FIG. 1 is a perspective view of the tread configuration in foldedcondition for use on a front side and an end portion of a folding caseshown in broken lines;

FIG. 2 is a perspective view of the tread design for use on a rear sideof the FIG. 1 case;

FIG. 3 is a plan view of the FIG. 1 and FIG. 2 tread configuration inunfolded condition for use on front and rear sides, and at the end, ofthe FIG. 1 case shown in broken lines; and,

FIG. 4 is a plan view like FIG. 3, showing a modified treadconfiguration with arcuate edges, for use on front and rear sides, andat the end, of a modified case shown in broken lines.

The ornamental design for a tread configuration on folding case, asshown and described.